Fattayati, F., M. Masrukan, and D. Dwijanto. “Mathematical Creative Thinking Ability and Self-Regulation Character of Class X Students in Problem Based Learning Assisted by Google Classroom in Terms of Goal Orientation”. Unnes Journal of Mathematics Education Research, Vol. 10, no. 2, Dec. 2021, pp. 144-50, https://journal.unnes.ac.id/sju/ujmer/article/view/46310.